Description:

During development, it is fairly common to cycle between writing code
and testing that code. Generally the testing happens within the test
suite, but frequently it is more convenient to test things by hand
when tracking down a bug, or when doing some exploratory coding. In
many situations, however, this becomes inconvenient - for instance, in
a REPL, or in a stateful web application, restarting from the
beginning after every code change can get pretty tedious. This module
allows you to reload your application classes on the fly, so that the
code/test cycle becomes a lot easier.